<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>圆角边框</title>
    <link rel="stylesheet" href="border.css">

</head>

<body>
    <div class="qwe">
        <div class="div1">1</div>
        <div class="div2">2</div>
        <div class="div3">3</div>
        <div class="div4">4</div>
        <div class="div5">5</div>
        <div class="div6">6</div>
        <div class="div7">7</div>
        <div class="div8">8</div>
        <div class="div9">9</div>
    </div>

</body>

</html>